Improvement in piston-packings



J. H. F'. OTTO. PIsToN-PACKINGS.

No. 195,771. Patented 0 :t.2,18774 ATTUBNElS.

N. PETERS, FHOTD-LITNOGRAFHER, WASHKNGTON, D C.

UNITED STATES PATENT OFFICE.

J. H. FERDINAND OTTO, OF REEDSVILLE, WISCONSIN.

IMPROVEMENT IN PISTON-PACKINGS.

Specification forming part of Letters Patent No. 195,771, dated October2, 1877; application led v April 30, 1877.

To all whom it may concern:

Beit known that I, J. H. FERDINAND OTTO, of Reedsville, in the county ofManitowoc and State of Wisconsin, 4have invented a new and ImprovedPiston-Packing, of which the following is a specification:

In the accompanying drawings, Figure 1 represents a top view of myimproved pistonpacking, with end plate removed to show interior parts;and Fig. 2 is a vertical central section of the piston on line c c, Fig.1.

Similar .letters of reference indicate corresponding parts.

The invention relates to improvements in metallic piston-packing, bywhich the packingrings are readily adjusted to the required degree oftightness by a simple and easily-operated mechanism., which may also beintroduced into any piston in use.

The invention will rst be described in connection with the drawings, andthen pointed out in the claim.

In the drawing, A represents the piston of a steam-cylinder, pump, &c.;and B, Ithe inner and outer split packing-rings, of suitable metal, thatare guided between the end plates of the piston, and expanded by threeor more interior band-springs, C, of suitable power and width, accordingto the sizeof the piston.

The expanding-springs C are operated upon by sliding nuts D, that aremoved forward or back by means of radial screws O', which are operatedby a worm-gear, E E. The shafts of the intermeshing pinions E passparallel to the piston-rod into inner sockets a of the face-plate A',which is attached, by screwbolts, to the body of the piston. The slidingnut is guided between lugs d on the inside faces of piston-head andfollower.

The socket-openings of the face-plate are closed by short cap-screws b,which admit, when removed, the engaging of the key with the nicked endsof the pinion-shafts, so as to turn the same and set the springs andrings to the required degree of expansion. The cap Ii prevents leakage,and serves at the same time as a stop to the driving-shafts to keep themin position and prevent play.

By taking out the cap-screws the split packing-rings may be readilyadjusted to the bore of the cylinder and to any degree of tightness, thesame being reset from time to time, to provide for wear, and for thereplacing of the rings and of the expanding springs when worn out, bymerely taking oi the face-plate of the piston.

Having thus described my invention, I claim as new and desire to secureby Letters latent- The combinationwith springs C, that set against thesplit rings of a piston7 of the nuts D, sliding in guides d, the radialswveled screws C', the wormwheel E, and the endnicked worm-shaft, all asshown and described.

J. H. FERDINAND OTTO.

Vitnesses J. F. POPE, DANIEL MoNToURE.

